CN110230527A - The emission-control equipment of internal combustion engine - Google Patents

The emission-control equipment of internal combustion engine Download PDF

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Publication number
CN110230527A
CN110230527A CN201910156125.6A CN201910156125A CN110230527A CN 110230527 A CN110230527 A CN 110230527A CN 201910156125 A CN201910156125 A CN 201910156125A CN 110230527 A CN110230527 A CN 110230527A
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China
Prior art keywords
amount
fuel ratio
air
trap
next door
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Granted
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CN201910156125.6A
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Chinese (zh)
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CN110230527B (en
Inventor
桥本浩成
岩崎靖志
冈崎俊太郎
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Toyota Motor Corp
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Toyota Motor Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9413—Processes characterised by a specific catalyst
    • B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0864—Oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/101—Three-way catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/908—O2-storage component incorporated in the catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/915—Catalyst supported on particulate filters
    • B01D2255/9155—Wall flow filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/02—Catalytic activity of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1606—Particle filter loading or soot amount
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1624—Catalyst oxygen storage capacity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

A kind of emission-control equipment of internal combustion engine is provided, accurately presumption supports the oxygen occlusion capacity in the catalyst of trap.Have: trap is supported with the catalyst with oxygen occlusion capacity；Air-fuel ratio detection unit detects the air-fuel ratio of the exhaust than trap downstream；Air fuel ratio control unit makes the air-fuel ratio variation of the exhaust flowed into trap；Accumulating amount scavenging valve estimates the amount for the particulate material being piled up in the next door of trap；Occlusion amount scavenging valve, according to the variation of the air-fuel ratio of the exhaust obtained by air-fuel ratio detection unit when changing the air-fuel ratio of exhaust by air fuel ratio control unit, to estimate the maximum oxygen occlusion amount of catalyst；And amending unit, the maximum oxygen occlusion amount of catalyst is corrected based on the amount of the particulate material in the next door for being piled up in trap.

Description

The emission-control equipment of internal combustion engine
Technical field
The present invention relates to the emission-control equipments of internal combustion engine.
Background technique
The known exhaust channel in internal combustion engine have equipped with the catalyst with oxygen occlusion capacity grain catcher (with Under, referred to as " trap ").When the catalyst degradation, the amount of the oxygen that can be absorbed to greatest extent in the catalyst (hereinafter, Also referred to as maximum oxygen occlusion amount) it reduces, therefore the deterioration judging of catalyst can be carried out based on maximum oxygen occlusion amount.Here, It has been known that there is correct maximum based on the temperature of the amount for the particulate material (hereinafter, also referred to as PM) for being piled up in trap and trap Oxygen occlusion amount carries out the technology of deterioration judging based on revised maximum oxygen occlusion amount (for example, referring to patent document 1).
In the deterioration judging of catalyst, made the air-fuel ratio of the exhaust flowed into catalyst clip chemically correct fuel and From dense side to dilute side or the control changed from dilute side to dense side.For example, when the air-fuel ratio of the exhaust flowed into catalyst is from than reason When being changing into the air-fuel ratio smaller than chemically correct fuel by the big air-fuel ratio of air-fuel ratio, the oxygen absorbed in catalyst can be released.And It is attached in chemically correct fuel in the air-fuel ratio for the exhaust for locating detection downstream than catalyst and during carrying out the releasing of the oxygen Closely become constant.As associated with the maximum oxygen occlusion amount of catalyst during near the chemically correct fuel, therefore being capable of base In finding out maximum oxygen occlusion amount during this period.But oxygen after by releasing from catalyst and the PM that is piled up in trap are anti- When answering and consuming oxygen, become the constant phase near chemically correct fuel in the air-fuel ratio for the exhaust for locating detection downstream than catalyst Between shorten.So, it may judge by accident and be set to the decline of oxygen occlusion capacity, therefore in patent document 1, will be consumed by PM Amount the amendment that is added with maximum oxygen occlusion amount of oxygen occlusion amount.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2005-264808 bulletin
Summary of the invention
Problems to be solved by the invention
Describe in patent document 1 causes maximum oxygen occlusion amount to be calculated to obtain the project fewer than actually because of PM, but sends out Having showed maximum oxygen occlusion amount can change according to the accumulation position of PM.Therefore, if correcting maximum oxygen occlusion amount as so previous, Misinterpretation may be generated in the deterioration judging of catalyst.
The present invention is completed in view of problem as described above, and its object is to accurately estimate to support in trap The oxygen occlusion capacity of catalyst.
Solution for solving the problem
For solve the above subject the solution of the present invention first is that a kind of emission-control equipment of internal combustion engine, has: Grain trap, is set to the exhaust channel of internal combustion engine, is supported with the catalyst with oxygen occlusion capacity；Air-fuel ratio detection unit, Detect the air-fuel ratio of the exhaust than the grain catcher downstream；Air fuel ratio control unit is detected to the grain catcher The air-fuel ratio of the exhaust of inflow；Accumulating amount scavenging valve estimates the granular substance being piled up in the next door of the grain catcher The amount of matter；Occlusion amount scavenging valve, according to by the air fuel ratio control unit make exhaust air-fuel ratio change when by the sky The variation of the air-fuel ratio of the exhaust obtained than detection unit is fired, to estimate the maximum oxygen occlusion amount of the catalyst；And amendment is single Member, the maximum oxygen that the catalyst is corrected based on the amount of the particulate material estimated by the accumulating amount scavenging valve are inhaled Reserve.
The air-fuel ratio of exhaust based on ratio catalyst when changing the air-fuel ratio of the exhaust flowed into catalyst downstream Variation, the maximum oxygen occlusion amount of catalyst can be found out.It has however been found that maximum oxygen occlusion amount can be due to the position that PM accumulates It is affected.In the trap for being supported with catalyst, understand, maximum oxygen occlusion amount according in the next door of trap (that is, Be formed in the inside of the pore in next door) PM accumulating amount and change, but not according to the surface in the next door of trap (that is, being formed in The outside of the pore in next door) PM accumulating amount and change.Therefore, even if the degree of the deterioration of catalyst is for example identical, maximum oxygen Occlusion amount may also change according to the position that PM accumulates.Therefore, if for example implementing catalyst based on maximum oxygen occlusion amount Deterioration judging may then generate misinterpretation.Then, amending unit corrects maximum oxygen occlusion amount.
Since maximum oxygen occlusion amount changes according to the PM accumulating amount in the next door of trap, so in the next door of trap PM accumulating amount and maximum oxygen occlusion amount variable quantity have correlation.Thus, amending unit can be based on the next door of trap Interior PM accumulating amount corrects maximum oxygen occlusion amount.In this way, can be difficult to by amendment maximum oxygen occlusion amount by trap The influence of PM accumulating amount in next door.Therefore, the oxygen occlusion capacity of catalyst can more precisely be estimated.
In addition, the amending unit can the particulate material estimated by the accumulating amount scavenging valve amount it is more When compared with when few, make by the maximum oxygen occlusion amount to reduce side correct when correction amount it is bigger.
The variation of PM accumulating amount of the amending unit in next door of the maximum oxygen occlusion amount according to trap and changed In the case where, maximum oxygen occlusion amount is corrected in a manner of eliminating the variable quantity.It finds out and is not accumulated in the next door of trap as a result, The maximum oxygen occlusion amount of the state of PM.Thus, if the PM accumulation quantitative change in such as next door is more, maximum oxygen occlusion amount becomes larger, because The correction amount of this maximum oxygen occlusion amount also becomes larger.Therefore, amending unit is when the amount of the PM estimated by accumulating amount scavenging valve is more Compared with when few, make maximum oxygen occlusion amount is bigger to the correction amount reduced when side is corrected.Thereby, it is possible to more precisely push away Determine the oxygen occlusion capacity of catalyst.
Invention effect
In accordance with the invention it is possible to which accurately presumption supports the oxygen occlusion capacity in the catalyst of trap.
Detailed description of the invention
Fig. 1 is the figure for showing the outline structure of gas handling system and exhaust system of the internal combustion engine of embodiment.
Fig. 2 is the passage for showing target air-fuel ratio (solid line) and the air-fuel ratio (single dotted broken line) than three-way catalyst downstream Figure.
Fig. 3 is shown in the case where not accumulating PM in trap through the flowing of the exhaust of trap.
Fig. 4 shows the flowing of the exhaust for the midway accumulated in the next door of PM forward direction trap.
Fig. 5 show PM into the next door of trap accumulation terminate and the surface in the next door of PM forward direction trap accumulation The flowing of the exhaust of midway.
Fig. 6 is the PM accumulating amount and the figure of the relationship of the maximum oxygen occlusion amount found out by Cmax method shown in trap.
Fig. 7 is the correction amount for showing PM accumulating amount (accumulating amount in next door) and maximum oxygen occlusion amount in the next door of trap The figure of the relationship of Δ C.
Fig. 8 is to show the flow chart for calculating the process of accumulating amount in next door.
Fig. 9 is the flow chart for showing the process of amendment maximum oxygen occlusion amount.
Figure 10 is the flow chart for showing the process of deterioration judging of three-way catalyst.
Specific embodiment
Hereinafter, the mode for implementing the invention is illustratively described in detail based on embodiment referring to attached drawing.No It crosses, size, material, shape and its relative configuration of component parts documented by the embodiment etc. are recorded just as long as no special It is not intended to the range of the invention being defined in this.
(embodiment)
Fig. 1 is the figure for showing the outline structure of gas handling system and exhaust system of the internal combustion engine 1 of present embodiment.Internal combustion engine 1 is the petrol engine of vehicle traction.But, internal combustion engine 1 is also possible to diesel engine.The row of being connected on internal combustion engine 1 Gas access 2.The grain catcher 3 (hereinafter referred to as trap 3) for being supported with three-way catalyst 31 is provided in exhaust channel 2.It catches Storage 3 is the trap of the wall-flow type of the PM in trapping exhaust, is caught in pore of the exhaust by the next door for being formed in trap 3 PM in collection exhaust.
Three-way catalyst 31 has oxygen occlusion capacity, when catalyst atmosphere is chemically correct fuel by NOx, HC and CO with most Big efficiency purification.Three-way catalyst 31 is the i.e. dilute air-fuel ratio of the air-fuel ratio bigger than chemically correct fuel in the air-fuel ratio of the exhaust of inflow When absorb oxygen, release oxygen when the air-fuel ratio of the exhaust of inflow is the air-fuel ratio i.e. dense air-fuel ratio smaller than chemically correct fuel, thus Catalyst atmosphere can be maintained chemically correct fuel.The effect of oxygen occlusion capacity in this way, even if to three-way catalyst The air-fuel ratio of 31 exhausts flowed into is other than chemically correct fuel, and three-way catalyst 31 can also purify HC, CO and NOx.It needs Bright, in the present embodiment, three-way catalyst 31 is equivalent to the catalyst in the present invention.As long as the catalyst in the present invention With oxygen occlusion capacity, therefore can also be using the catalyst with oxygen occlusion capacity other than three-way catalyst 31.
It is passed in the first air-fuel ratio of the air-fuel ratio for being provided with detection exhaust than the exhaust channel 2 by the upstream of three-way catalyst 31 Sensor 11.In addition, in the second air-fuel of the air-fuel ratio for being provided with detection exhaust than the exhaust channel 2 of three-way catalyst 31 downstream Than sensor 12 and the temperature sensor 13 of the temperature of detection exhaust.It should be noted that the first air-fuel ratio sensor 11 and Two air-fuel ratio sensors 12 can be the oxygen concentration sensor of such as Limiting current formula, and it is (deep or light to be also possible to such as electromotive force formula Battery type) oxygen concentration sensor (O2Sensor).The oxygen concentration sensor of Limiting current formula is defeated in wide air/fuel region Voltage corresponding with air-fuel ratio out.On the other hand, the oxygen concentration sensor of electromotive force formula (deep or light battery type) is in chemically correct fuel The voltage of lower output cataclysm.It should be noted that in the present embodiment, the second air-fuel ratio sensor 12 is equivalent in the present invention Air-fuel ratio detection unit.In addition, be provided in exhaust channel 2 detect the pressure of exhaust than trap 3 on the upstream side with than The differential pressure pick-up 14 of the difference of the pressure of the exhaust of 3 downstream of trap.
In addition, being provided with the injection valve 4 to in-cylinder injection fuel for each cylinder in internal combustion engine 1.Moreover, in internal combustion engine Intake channel 5 is connected on 1.Intake channel 5 is provided with the air flow meter 15 of the flow of detection air inlet.
Also, it is provided with electronic control unit (ECU) 10 together in internal combustion engine 1.The operating shape of ECU10 control internal combustion engine 1 State and emission-control equipment etc..On ECU10 in addition to the first above-mentioned air-fuel ratio sensor 11, the second air-fuel ratio sensor 12, Crankshaft position sensor 16 and accelerator opening sensor 17 are also electrically connected with except differential pressure pick-up 14, air flow meter 15, The detected value of each sensor is transmitted to ECU10.
ECU10 will appreciate that the internal-combustion engine rotational speed of the detection based on crankshaft position sensor 16, be passed based on accelerator opening The operating condition of the internal combustion engines such as the engine load of the detection of sensor 17 1.It should be noted that in the present embodiment, to three The air-fuel ratio for the exhaust that first catalyst 31 flows into can be detected by the first air-fuel ratio sensor 11, but can also be based on by air stream Inhaled air volume that meter 15 detects and fuel injection amount from injection valve 4 estimate the air-fuel ratio of exhaust.In addition, ECU10 The temperature of trap 3 and three-way catalyst 31 can be detected based on the temperature of the exhaust detected by temperature sensor 13.It needs Illustrate, due to trap 3 and three-way catalyst 31 be it is integrated, so the temperature of trap 3 and three-way catalyst 31 Temperature is equal.In addition, the temperature detected by temperature sensor 13 also can be set to the temperature of trap 3 and three-way catalyst 31. ECU10 can also estimate the temperature of trap 3 and three-way catalyst 31 based on the operating condition of internal combustion engine 1.In addition, due to There is relevance, so ECU10 can be passed based on differential pressure between the detected value of differential pressure pick-up 14 and the PM accumulating amount of trap 3 The detected value of sensor 14 detects the PM accumulating amount of trap 3.The detected value of differential pressure pick-up 14 and the PM accumulating amount of trap 3 Relationship first pass through experiment or simulation etc. in advance and find out.It should be noted that the PM accumulating amount of trap 3 can also as be described hereinafter that Sample is calculated based on operating condition of internal combustion engine 1 etc..
In addition, ECU10 implements the deterioration judging of three-way catalyst 31.ECU10 is absorbed in the maximum oxygen of three-way catalyst 31 In the case that amount becomes fewer than lower limit value, it is determined as that the three-way catalyst 31 is deteriorated.Deterioration said here refers to nothing The heat deterioration etc. that method is restored.In the present embodiment, the maximum oxygen occlusion amount of three-way catalyst 31 is found out using Cmax method, is led to It crosses and is compared to the maximum oxygen occlusion amount and lower limit value to implement the deterioration judging of three-way catalyst 31.Here, three-element catalytic The maximum oxygen occlusion amount of agent 31 changes with from the air-fuel ratio of the exhaust flowed into three-way catalyst 31 from dense air-fuel ratio as dilute air-fuel Compared with until the air-fuel ratio for the exhaust flowed out from three-way catalyst 31 is to the variation of dilute air-fuel ratio time and air-fuel ratio it is associated. Equally, the maximum oxygen occlusion amount of three-way catalyst 31 with from the air-fuel ratio of the exhaust flowed into three-way catalyst 31 from dilute air-fuel ratio Variation be dense air-fuel ratio play from three-way catalyst 31 flow out exhaust air-fuel ratio to dense air-fuel ratio variation until time and Air-fuel ratio is associated.Therefore, the maximum oxygen occlusion amount of three-way catalyst 31 can be calculated based on these times and air-fuel ratio.
For example, maximum oxygen occlusion amount can be calculated by Cmax method as shown in Figure 2.Fig. 2 is to show target air-fuel ratio The figure of the passage of (solid line) and the air-fuel ratio (single dotted broken line) of the exhaust than three-way catalyst 31 downstream.Target air-fuel ratio is interior Target air-fuel ratio in the cylinder of combustion engine 1.It should be noted that target air-fuel ratio can also be replaced and be set as comparing three-way catalyst 31 air-fuel ratios by the upstream.When calculating maximum oxygen occlusion amount by Cmax method, implementation makes target air-fuel ratio clip theoretical air-fuel Than and change control, that is, active control.It should be noted that in the present embodiment, ECU10 is by implementing active control It is functioned as the air fuel ratio control unit in the present invention.ECU10 is by executing the storage unit (figure having in the ECU10 Show omission) in pre-stored program implement active control.In active control, in the row than three-way catalyst 31 downstream The air-fuel ratio of gas be the air-fuel ratio that is detected by the second air-fuel ratio sensor 12 from the variation of dense air-fuel ratio be dilute air-fuel ratio when, by target Air-fuel ratio switches to dense air-fuel ratio, and changing in the air-fuel ratio detected by the second air-fuel ratio sensor 12 from dilute air-fuel ratio is dense air-fuel Than when, target air-fuel ratio is switched to dilute air-fuel ratio.ECU10 by make actual air-fuel ratio close to target air-fuel ratio in a manner of adjust Fuel injection amount etc. from injection valve 4.It should be noted that if the second air-fuel ratio sensor 12 is electromotive force formula (deep or light electricity Pool) oxygen concentration sensor (O2Sensor), then after the air-fuel ratio of detection is just from the variation of dense air-fuel ratio for dilute air-fuel ratio, Target air-fuel ratio is switched to dense air-fuel ratio from dilute air-fuel ratio.It on the other hand, is Limiting current in the second air-fuel ratio sensor 12 In the case where the oxygen concentration sensor of formula, target air-fuel ratio can also be switched when dilute air-fuel ratio as defined in becoming.That is, even if The air-fuel ratio of detection becomes dilute air-fuel ratio and does not also switch target air-fuel ratio to dense air-fuel ratio immediately, can also maintain detection Air-fuel ratio is that the state of dilute air-fuel ratio switches target air-fuel ratio later.This is because even if releasing oxygen from three-way catalyst 31 In the case where, strictly speaking the air-fuel ratio for the exhaust flowed out from three-way catalyst 31 also deviates from chemically correct fuel sometimes, therefore Do not switch air-fuel ratio in this case.
In Fig. 2, the line packet of the air-fuel ratio by the line and expression of expression target air-fuel ratio than three-way catalyst 31 downstream The area for the range (range for being coated with hachure) enclosed is proportional to the maximum oxygen occlusion amount of three-way catalyst 31.It therefore, if should The relationship of area and maximum oxygen occlusion amount first passes through experiment or simulation etc. in advance and finds out, then can find out maximum oxygen based on the area Occlusion amount.Area A when can be dilute air-fuel ratio based on target air-fuel ratio finds out maximum oxygen occlusion amount, can also be based on target Area B when air-fuel ratio is dense air-fuel ratio finds out maximum oxygen occlusion amount, when to be also based on target air-fuel ratio be dilute air-fuel ratio The average value of area B when being dense air-fuel ratio of area A and target air-fuel ratio find out maximum oxygen occlusion amount.In present embodiment In, ECU10 is functioned and finding out maximum oxygen occlusion amount using Cmax method as the occlusion amount scavenging valve in the present invention. ECU10 is inhaled by executing in storage unit that the ECU10 has (diagram is omitted) pre-stored program to estimate maximum oxygen Reserve.Although can also replace it should be noted that estimating maximum oxygen occlusion amount using Cmax method in the present embodiment It is used based on the ratio three-way catalyst 31 when changing the air-fuel ratio of the exhaust flowed into three-way catalyst 31 downstream in this The known techniques of variation of air-fuel ratio find out maximum oxygen occlusion amount.
How the maximum oxygen occlusion amount found out as described so is piled up in trap 3 according to PM and is affected.Fig. 3 is shown PM do not accumulated to trap 3 in the case where by the flowing of the exhaust of trap 3.Fig. 4 show PM forward direction trap 3 every The flowing of the exhaust for the midway that 3B accumulates in wall.Fig. 5 shows that PM accumulation of 3B into the next door of trap 3 terminates and PM is positive The flowing of the exhaust of the midway of the surface 3A accumulation in the next door of trap 3.In Fig. 3, Fig. 4, Fig. 5, by the flowing arrow of exhaust Head indicates, the thickness of the flow of exhaust arrow is indicated.As shown in figure 3, in the state that PM is not accumulated to trap 3, row Gas is easy to lead to the big position of fine pore.In this case, the PM for including in exhaust can also flow at the bigger position of fine pore It is logical, therefore PM is easy to be captured at the bigger position of the fine pore.At this point, being absorbed at the bigger position of fine pore Oxygen.
Also, when PM is captured and is piled up in the bigger position of fine pore, as shown in figure 4, exhaust is difficult to by thin The biggish position of aperture ratio, exhaust can more circulate to the smaller position of fine pore.Thus, PM is also captured and is piled up in The smaller position of fine pore.At this point, absorbing oxygen at the smaller position of fine pore.It should be noted that understand, In the case that PM is accumulated to trap 3, as shown in figure 4, mainly into next door, 3B accumulates PM first, later, as shown in figure 5, PM Mainly accumulated to the surface 3A in next door.Even if PM as shown in Figure 5 is accumulated to the surface 3A in the next door of trap 3, in next door The flowing of the exhaust of 3B also hardly changes.Therefore, at this point, absorbing oxygen at the smaller position of fine pore.
The PM of 3B in the surface 3A and next door in the next door of trap 3 is piled up in the condition of high temperature (such as 500 DEG C or more) and There are be oxidized and remove when the state of oxygen in exhaust.For example, trap 3 becomes high temperature in the high loaded process of internal combustion engine 1 State.Also, later, when for example carrying out fuel cut-off or when operating internal combustion engine 1 under dilute air-fuel ratio, become the condition of high temperature and There are the state of oxygen in exhaust, the PM for being piled up in trap 3 is oxidized.When the PM for being piled up in trap 3 is oxidized, understand , firstly, mainly aoxidize since being piled up in next door the PM of 3B, after the PM for being piled up in 3B in next door is removed, main heap Product is oxidized in the PM of the surface 3A in next door.
Occlusion of the oxygen to three-way catalyst 31 is carried out by the occlusion point contact of oxygen and three-way catalyst 31.Therefore, when When as oxygen and more states for absorbing point contact, maximum oxygen occlusion amount is more.Here, when PM is into the next door of trap 3 3B accumulation and when the flowing of the exhaust of 3B changes in a manner of through the smaller position of fine pore in next door, exhaust can be into next door The wider circulation of 3B, therefore the occlusion point contacted with oxygen is more.Therefore, with PM, into the next door of trap 3,3B accumulates, It is more that maximum oxygen absorbs quantitative change.Later, as 3B in the next door that a degree of PM is piled up in trap 3 and 3B no longer can in next door When enough trapping PM, PM is accumulated to the surface 3A in the next door of trap 3.Even if PM is accumulated to the surface 3A in the next door of trap 3, catch The flowing of the exhaust of 3B also hardly changes in the next door of storage 3, therefore the quantity of the occlusion point contacted with oxygen is also almost unchanged Change.Therefore, even if PM accumulating amount increases at the surface 3A in the next door of trap 3, maximum oxygen occlusion amount also hardly changes.
In addition, understand, in the case where the PM for being piled up in trap 3 is oxidized, firstly, mainly from being piled up in trapping The PM of 3B plays oxidation in the next door of device 3.As 3B removes PM out of next door, exhaust can be flowed at the bigger position of fine pore, because This oxygen and the chance for absorbing point contact are reduced.Thus, with the reduction of PM accumulating amount, it is few that maximum oxygen absorbs quantitative change.In addition, in heap After the PM of 3B in the next door of trap 3 is removed, the PM for being piled up in the surface 3A in the next door of trap 3 is oxidized product.Even if The PM for being piled up in the surface 3A in the next door of trap 3 is reduced, and the flowing of the exhaust of 3B is also almost unchanged in the next door of trap 3 Change, therefore maximum oxygen occlusion amount hardly changes.
In this way, maximum oxygen occlusion amount may be piled up in the position of trap 3 according to PM and change.
Fig. 6 is the PM accumulating amount and the relationship of the maximum oxygen occlusion amount found out by Cmax method shown in trap 3 Figure." first state " of Fig. 6 is the state of the midway that mainly 3B is captured in the next door of trap 3 PM, shows trap 3 Next door in 3B the increased midway of PM accumulating amount state when PM accumulating amount and maximum oxygen occlusion amount relationship.Fig. 6 " the Two-state " is the state for the midway that PM is mainly captured at the surface 3A in the next door of trap 3, show trap 3 every The relationship of PM accumulating amount and maximum oxygen occlusion amount when the state of the increased midway of PM accumulating amount of the surface 3A of wall.Fig. 6 " the Three condition " is the state of the mainly midway of 3B removing PM out of trap 3 next door, shows 3B in the next door of trap 3 The relationship of PM accumulating amount and maximum oxygen occlusion amount when the state of the midway of PM accumulating amount reduction." the 4th state " of Fig. 6 is main The state that the midway of PM is removed from the surface 3A in the next door of trap 3, shows the PM heap of the surface 3A in the next door of trap 3 The relationship of PM accumulating amount and maximum oxygen occlusion amount when the state of the midway of accumulated amount reduction.As described above, in the first state, with PM accumulating amount increase and maximum oxygen occlusion amount increase, in the second condition, though PM accumulating amount increase, maximum oxygen occlusion amount Also hardly change.In addition, in a third condition, with the reduction of PM accumulating amount, maximum oxygen occlusion amount is reduced, in the 4th shape Under state, even if PM accumulating amount is reduced, maximum oxygen occlusion amount also hardly changes.
In this way, the maximum oxygen occlusion amount found out by Cmax method becomes according to the PM accumulating amount of 3B in the next door of trap 3 Change, therefore in the case where determining the deterioration of three-way catalyst 31 compared with lower limit value based on maximum oxygen occlusion amount, it may Misinterpretation can be generated.Then, ECU10 is corrected according to the PM accumulating amount of 3B in the next door of trap 3 is found out using Cmax method Maximum oxygen occlusion amount.In the present embodiment, so that revised maximum oxygen occlusion amount indicates to assume that PM is not piled up in trap 3 In the state of the mode of maximum oxygen occlusion amount be modified.It should be noted that in the present embodiment, ECU10 is by repairing Positive maximum oxygen occlusion amount and functioned as the amending unit in the present invention.ECU10 has by execution in the ECU10 Pre-stored program corrects maximum oxygen occlusion amount in storage unit (diagram omit).
Fig. 7 is the PM accumulating amount (hereinafter, accumulating amount also referred to as in next door) and maximum oxygen of 3B in the next door for show trap 3 The figure of the relationship of the correction amount C of occlusion amount.ECU10 is by subtracting correction amount from the maximum oxygen occlusion amount found out using Cmax method Δ C corrects maximum oxygen occlusion amount.Accumulating amount is more in next door, then maximum oxygen occlusion amount more increases, therefore to cancel the increase The mode of amount sets correction amount C.Thus, when accumulating amount is more in next door compared with when few, correction amount C becomes larger.Shown in Fig. 7 Relationship first pass through experiment or simulation etc. in advance and find out and as amendment mapping storage in ECU10.
Then, the method for accumulating amount in presumption next door is illustrated.Accumulating amount can be by from trapping in next door The PM amount that 3B is trapped per unit time in the next door of device 3 subtracts the 3B in the next door of trap 3 and subtracts per unit time because of oxidation Value obtained from few PM amount is added up to obtain.When in the state that PM is not piled up in trap 3 PM to trap 3 flow into When, firstly, PM 3B in the next door of trap 3 is captured.At this point, the PM amount flowed into per unit time to trap 3 is equivalent to The PM amount that 3B is trapped per unit time in the next door of trap 3.But the PM that 3B can be trapped in the next door of trap 3 There are the upper limits for amount.It should be noted that hereinafter, the upper limit of accumulating amount in next door is also referred to as accumulating amount in upper limit next door.When every When accumulating amount reaches accumulating amount in upper limit next door in wall, backward trap 3 flow into PM to the surface 3A in next door accumulate.Cause This, accumulating amount reaches in upper limit next door after accumulating amount in next door, and the PM amount flowed into per unit time to trap 3 is equivalent to The PM amount that surface 3A in the next door of trap 3 is trapped per unit time.It should be noted that hereinafter, trap 3 will be piled up in Next door surface 3A PM amount be also referred to as " surface accumulating amount ".The amount of the PM flowed into per unit time to trap 3 with it is interior The operating condition of combustion engine 1 is associated, therefore can be found out based on the operating condition of internal combustion engine 1 to trap 3 per unit time The amount of the PM of inflow.The relationship can first pass through experiment or simulation etc. in advance and find out.
When implementing the regeneration of trap 3, PM is reduced from trap 3.Subtracted per unit time by the regeneration of trap 3 The amount of few PM is associated with the operating condition of the temperature of trap 3 and internal combustion engine 1, thus by the relationship in advance first pass through experiment or Simulation etc. is found out.When implementing the regeneration of trap 3, firstly, accumulating amount is reduced in next door.The 3B out of next door in trap 3 The PM amount trapped per unit time subtract in the next door of trap 3 3B per unit time due to oxidation the PM amount of reduction and obtain Value be equivalent to the variable quantity per unit time of accumulating amount in next door.In the regeneration of trap 3, which becomes negative It is worth and accumulating amount reduction in next door.Also, when accumulating amount becomes 0 in next door, then, it is piled up in the table in the next door of trap 3 The PM of face 3A is oxidized, therefore surface accumulating amount is reduced.The PM trapped per unit time from the surface 3A in the next door in trap 3 Amount subtracts that value obtained from the PM amount of reduction is equivalent to surface due to oxidation per unit time in the surface 3A in the next door of trap 3 The variable quantity per unit time of accumulating amount.In the regeneration of trap 3, which becomes the value born and surface accumulating amount subtracts It is few.It should be noted that in the case where the regeneration ending of the regenerated midway trap 3 of trap 3, it can be in trap 3 PM is remained on the surface 3A in next door.At this time, it was found that, even if accumulating amount is smaller than accumulating amount in upper limit next door in next door, to trapping The PM that device 3 flows into 3B will not be captured in the next door of trap 3, and can be captured in the surface 3A in the next door of trap 3.
Fig. 8 is to show the flow chart for calculating the process of accumulating amount PMM in next door.This flow chart is by ECU10 with defined fortune Calculate period execution.Therefore, ECU10 will appreciate that accumulating amount PMM in next door at any time.In step s101, determine surface accumulating amount Whether PMMS is specified amount or less.Specified amount is sufficiently few surface accumulating amount, is the next door Nei Dui when PM is flowed into trap 3 Accumulated amount PMM may increased surface accumulating amount.It has made in step s101 and has entered step S102 in the case where determining certainly, It has made in the case that negative determines and has entered step S106.In step S1022, determine whether accumulating amount PMM is less than in next door Accumulating amount in upper limit next door.In other words, in step s 102, whether determine PM can be caught 3B trapping in the next door of storage 3.? It has been made in step S102 and has entered step S103 in the case where determining certainly, entered step in the case where having made negative and having determined S106。
In step s 103, PM influx PMT is calculated.PM influx PMT is that trap 3 is flowed into execution cycle The total amount of PM.Here, the amount of the PM flowed into per unit time to trap 3 and internal combustion engine 1 operating condition (internal-combustion engine rotational speed and Engine load) there is correlativity.If the correlativity is first passed through experiment or simulation etc. in advance to find out, internal combustion can be based on The operating condition of machine 1 come find out per unit time to trap 3 flow into PM amount.Also, by per unit time to catching The amount for the PM that storage 3 flows into is added up with execution cycle, can find out PM influx PMT.The PM flowed at this time to trap 3 It is caught 3B trapping in the next door of storage 3.
In step S104, the PM amount of oxidation PMS of 3B in next door is calculated.The PM amount of oxidation PMS of 3B is to trap in next door The total amount for the PM that 3B is oxidized in execution cycle in the next door of device 3.At this point, due in the next door of trap 3 3B accumulation have PM, so the PM of 3B is oxidized in the next door of trap 3 first.3B is oxidized in the next door of trap 3 per unit time The amount of PM and the temperature of trap 3 and the operating condition of internal combustion engine 1 etc. have correlativity.If the correlativity is first passed through in advance Experiment or simulation etc. are found out, then can be found out per unit time based on the temperature of trap 3 and the operating condition of internal combustion engine 1 etc. The amount for the PM that 3B is oxidized in the next door of trap 3.Also, by the 3B quilt in the next door of trap 3 per unit time The amount of the PM of oxidation is added up with execution cycle, can find out the PM amount of oxidation PMS of 3B in next door.Then, in step S105 In, by plus PM influx PMT and subtracting PM oxidation to accumulating amount PMMO in the next door calculated in the execution cycle of last time PMS is measured to calculate accumulating amount PMM in next door.
On the other hand, in step s 106, same as step S104, calculate the PM amount of oxidation PMS of 3B in next door.Even if PM It is piled up in the surface 3A in the next door of trap 3, in the case that 3B remains PM in next door, firstly, the PM of 3B is by oxygen in next door Change, therefore calculates the amount of the PM being oxidized.It should be noted that the case where 3B does not remain PM in next door is (in the fortune of last time Calculate the case where accumulating amount PMMO is 0 in the next door calculated in the period) under, the PM amount of oxidation PMS of 3B becomes 0 in next door.Then, exist In step S107, PM amount of oxidation PMS is subtracted by accumulating amount PMMO in the next door that calculates from the execution cycle of last time to calculate Accumulating amount PMM in next door in this execution cycle out.It should be noted that at this point, due to the table in the next door of trap 3 Accumulation has PM on the 3A of face, is captured so being flowed into surface 3A of the PM of trap 3 in the next door of trap 3, therefore be not present The incrementss of accumulating amount PMM in next door.
It is same as step S103 in step S108, calculate PM influx PMT.It is caught at this time to the PM that trap 3 flows into The surface 3A in the next door of storage 3 is trapped.In step S109, the PM amount of oxidation PMSS of the surface 3A in the next door of trap 3 is calculated. It should be noted that in the case that 3B remains PM in next door, the PM amount of oxidation PMSS of the surface 3A in the next door of trap 3 at It is 0.The PM amount of oxidation PMSS of the surface 3A in next door is the PM that the surface 3A in the next door of trap 3 is oxidized in execution cycle Total amount.The amount for the PM that the surface 3A in the next door of trap 3 is oxidized per unit time and the temperature and internal combustion engine of trap 3 1 operating condition etc. has correlativity.If the correlativity is first passed through experiment or simulation etc. in advance to find out, can be based on catching The temperature of storage 3 and the operating condition of internal combustion engine 1 etc. are oxidized come the surface 3A for finding out per unit time in the next door of trap 3 PM amount.Also, the amount of the PM by being oxidized to the surface 3A per unit time in the next door of trap 3 is with execution cycle Added up, the PM amount of oxidation PMSS of the surface 3A in next door can be found out.Then, in step s 110, by last time The surface accumulating amount PMMSO calculated in execution cycle adds PM influx PMT and subtracts the PM of the surface 3A in the next door of trap 3 Amount of oxidation PMSS calculates surface accumulating amount PMMS.In such manner, it is possible to calculate accumulating amount in surface accumulating amount PMMS and next door respectively PMM。
It should be noted that ECU10 estimates list by executing flow chart shown in Fig. 8 as the accumulating amount in the present invention Member functions.In addition, known technology can be used also to estimate accumulating amount in next door in accumulating amount scavenging valve.ECU10 is logical It crosses and executes in storage unit that the ECU10 has (diagram is omitted) pre-stored program to estimate accumulating amount in next door.It needs It is noted that the PM amount being discharged from engine is fewer in petrol engine.In addition, in petrol engine, due to row The temperature of gas is high, so PM is oxidized easily.Thus, in petrol engine, PM is hardly to the surface in the next door of trap 3 3A accumulation.In this case, the differential pressure detected by differential pressure pick-up 14 and the correlation of accumulating amount in next door are high.Thus, it can also To estimate accumulating amount in next door based on the differential pressure detected by differential pressure pick-up 14.
In this way, due to will appreciate that accumulating amount in the next door under current point in time, so can be according to being accumulated in the next door It measures with relationship shown in Fig. 7 and finds out the correction amount of maximum oxygen occlusion amount.Fig. 9 is the process for showing amendment maximum oxygen occlusion amount Flow chart.This flow chart is executed by ECU10 every the defined time.
In step s 201, accumulating amount PMM in next door is read in.Accumulating amount PMM is grasped always by ECU10 in next door.In step In rapid S202, maximum oxygen occlusion amount Cmax is calculated.ECU10 executes active control and calculates maximum oxygen occlusion amount by Cmax method Cmax.In step S203, the calculating processing of the correction amount C of maximum oxygen occlusion amount Cmax is carried out.In this step S203, ECU10 calculates correction amount C based on accumulating amount PMM in the next door read in step s 201 and relationship shown in Fig. 7.So Afterwards, it in step S204, is subtracted by the maximum oxygen occlusion amount Cmax calculated from step S202 and is calculated in step S203 Correction amount C calculate revised maximum oxygen occlusion amount Cmax.
After calculating revised maximum oxygen occlusion amount Cmax in the step S204 of flow chart shown in Fig. 9, ECU10 base Implement the deterioration judging of three-way catalyst 31 in maximum oxygen occlusion amount Cmax.Figure 10 is to show the deterioration of three-way catalyst 31 to sentence The flow chart of fixed process.Deterioration judging shown in Fig. 10 is inhaled when by the revised maximum oxygen of flow chart shown in Fig. 9 calculating It is executed after reserve Cmax.In step S301, revised maximum oxygen occlusion amount Cmax is read in, determines that this is repaired in step s 302 Whether the maximum oxygen occlusion amount Cmax after just is lower limit value or more.The lower limit value is in the state of not accumulating PM in trap 3 It may be said that the lower limit value of the range of the normal maximum oxygen occlusion amount of three-way catalyst 31, first passes through experiment or simulation etc. in advance and finds out. It has made in step s 302 and has entered step S303 in the case where determining certainly, be determined as that three-way catalyst 31 is normal.Another party Face has made in the case that negative determines in step s 302 and has entered step S304, it is bad to be determined as that three-way catalyst 31 has occurred Change.
As described above, according to the present embodiment, due to the amount based on the PM of 3B in the next door for being piled up in trap 3 Maximum oxygen occlusion amount is corrected, so the oxygen occlusion capacity supported in the catalyst of trap 3 can be estimated accurately.Cause This is able to suppress the influence by PM stacking states and misinterpretation in the deterioration judging of three-way catalyst 31.Thereby, it is possible to Raising is supported in the precision of the deterioration judging of the catalyst of trap 3.
Label declaration
1 internal combustion engine
2 exhaust channels
3 grain catchers
The surface 3A
In the next door 3B
4 injection valves
5 intake channels
10 ECU
11 first air-fuel ratio sensors
12 second air-fuel ratio sensors
13 temperature sensors
14 differential pressure pick-ups
15 air flow meters
16 crankshaft position sensors
17 accelerator opening sensors
31 three-way catalysts.

Claims (2)

1. a kind of emission-control equipment of internal combustion engine, has:
Grain catcher is set to the exhaust channel of internal combustion engine, is supported with the catalyst with oxygen occlusion capacity；
Air-fuel ratio detection unit detects the air-fuel ratio of the exhaust than the grain catcher downstream；
Air fuel ratio control unit makes the air-fuel ratio variation of the exhaust flowed into the grain catcher；
Accumulating amount scavenging valve estimates the amount for the particulate material being piled up in the next door of the grain catcher；
Occlusion amount scavenging valve, according to by the air fuel ratio control unit make exhaust air-fuel ratio change when by the air-fuel ratio The variation of the air-fuel ratio for the exhaust that detection unit obtains, to estimate the maximum oxygen occlusion amount of the catalyst；And
Amending unit corrects the catalyst based on the amount of the particulate material estimated by the accumulating amount scavenging valve Maximum oxygen occlusion amount.
2. the emission-control equipment of internal combustion engine according to claim 1,
The amending unit when the amount of the particulate material estimated by the accumulating amount scavenging valve is more compared with when few, Make the maximum oxygen occlusion amount is bigger to the correction amount reduced when side is corrected.
CN201910156125.6A 2018-03-05 2019-03-01 Exhaust gas purification device for internal combustion engine Expired - Fee Related CN110230527B (en)

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